J/ApJ/882/69 Radio relic merging galaxy cluster substructures (Golovich+, 2019)
Merging cluster collaboration: a panchromatic atlas of radio relic mergers.
Golovich N., Dawson W.A., Wittman D.M., van Weeren R.J., Andrade-Santos F.,
Jee M.J., Benson B., de Gasperin F., Venturi T., Bonafede A., Sobral D.,
Ogrean G.A., Lemaux B.C., Bradac M., Bruggen M., Peter A.
<Astrophys. J., 882, 69 (2019)>
=2019ApJ...882...69G 2019ApJ...882...69G
ADC_Keywords: Clusters, galaxy; Redshifts; Radio continuum; X-ray sources
Keywords: galaxies: clusters: general; galaxies: clusters: intracluster medium;
radio continuum: general; X-rays: galaxies: clusters
Abstract:
Golovich et al. (2019, J/ApJS/240/39) present an optical imaging and
spectroscopic survey of 29 radio relic merging galaxy clusters. In
this paper, we study this survey to identify substructure and quantify
the dynamics of the mergers. Using a combined photometric and
spectroscopic approach, we identify the minimum number of
substructures in each system to describe the galaxy populations and
estimate the line-of-sight velocity difference between likely merging
subclusters. We find that the line-of-sight velocity components of the
mergers are typically small compared with the maximum 3D relative
velocity (usually <1000km/s and often consistent with zero). We
also compare our systems to n-body simulation analogs and estimate the
viewing angle of the clean mergers in our ensemble. We find that the
median system's separation vector lies within 40° (17°) at a
90% (50%) confidence level. This suggests that the merger axes of
these systems are generally in or near the plane of the sky, matching
findings in magnetohydrodynamical simulations. In 28 of the 29 systems
we identify substructures in the galaxy population aligned with the
radio relic(s) and presumed associated merger-induced shock. From this
ensemble, we identify eight systems to include in a "gold" sample that
is prime for further observation, modeling, and simulation study.
Additional papers will present weak-lensing mass maps and dynamical
modeling for each merging system, ultimately leading to new insight
into a wide range of astrophysical phenomena at some of the largest
scales in the universe.
Description:
We refer readers to Golovich+ (2019, J/ApJS/240/39), where we
presented our optical spectroscopic and photometric survey of the 29
systems.
In brief, we carried out a ground-based photometric campaign using
Subaru/Suprime-Cam imaging in two or three bands (typically g+r, g+i,
or g+r+i). We observed 18 of the clusters over four nights with
Suprime-Cam on 2013 Jul 13; 2014 Feb 25, 26 and 2015 Sep 12.
We also carried out a spectroscopic survey using Keck/DEIMOS
spectroscopy over 10 nights between 2013 and 2015. In total 54 slit
masks were observed.
In Table 2, we detail the radio and X-ray data that will be presented
in this paper. See Sections 3.2 and 3.3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 69 29 The merging cluster collaboration radio-selected
sample
table2.dat 77 29 Ancillary radio and X-ray data utilized in this paper
table3.dat 48 77 Priors for potential subclusters as deemed such by
the routine discussed in Section 4.3 for
29 merging clusters
table4.dat 39 155 MCMC-3D Gaussian mixture model (GMM) models run
for each system in our ensemble
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/79 : The VLA Low-frequency Sky Survey at 74MHz (Cohen+ 2007)
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
J/A+AS/124/283 : BR magnitude and redshift of A1300 (Pierre+ 1997)
J/A+AS/124/259 : Westerbork Northern Sky Survey I. (Rengelink+ 1997)
J/MNRAS/292/419 : Cooling flows in 207 clusters of galaxies (White+, 1997)
J/ApJS/122/51 : Spectroscopy of 10 rich galaxy clusters (Dressler+ 1999)
J/ApJ/580/774 : X-ray cluster of galaxies behind the MW (Ebeling+, 2002)
J/AJ/124/1918 : MX northern Abell cluster z survey. II. (Miller+, 2002)
J/A+A/392/795 : Multi-wavelength obs. of 2 gal. clusters (Valtchanov+, 2002)
J/MNRAS/339/913 : Two distant massive clusters of galaxies (Edge+, 2003)
J/A+A/399/813 : Multiple merging events in Abell 521 (Ferrari, 2003)
J/AJ/125/2427 : 1.4GHz flux densities of Abell 2255 galaxies (Miller+, 2003)
J/ApJS/149/53 : Multicolor photometry of A2255 galaxies (Yuan+, 2003)
J/AJ/132/1275 : CIRS (Cluster Infall Regions in the SDSS). I. (Rines+, 2006)
J/A+A/471/17 : SDSS-DR4 nearby clusters global properties (Aguerri+, 2007)
J/A+A/469/861 : Radial velocities of A115 galaxies (Barrena+, 2007)
J/ApJ/662/224 : Second CIZA subsample (Kocevski+, 2007)
J/A+A/481/593 : Radial velocities in A2163 (Maurogordato+, 2008)
J/A+A/503/357 : Redhift catalog of A1237+A1240 galaxies (Barrena+, 2009)
J/A+A/521/A78 : Velocities in the A2345 cluster (Boschin+, 2010)
J/MNRAS/404/325 : Massive galaxy clusters lensing analyse (Richard+, 2010)
J/ApJ/728/27 : Chandra & AAOmega observations of Abell 2744 (Owers+, 2011)
J/A+A/536/A8 : Planck early results. VIII. ESZ sample. (Planck+, 2011)
J/A+A/542/A36 : Rich clusters from SDSS DR8 (Einasto+, 2012)
J/ApJS/199/25 : CLASH sources for MACS1149.6+2223 (Postman+, 2012)
J/MNRAS/434/772 : Velocities in ZwCl2341.1+0000 field (Boschin+, 2013)
J/ApJ/772/131 : Musket Ball Cluster redshift catalog (Dawson, 2013)
J/A+A/555/A110 : Radio images of CIZA J2242.8+5301 (Stroe+, 2013)
J/A+A/551/A24 : GMRT Radio Halo Cluster Survey (Venturi+, 2013)
J/ApJS/211/21 : Spectroscopic redshifts of galaxies in MACS (Ebeling+, 2014)
J/ApJS/213/35 : SHELS: complete galaxy redshift survey (Geller+, 2014)
J/ApJ/805/143 : MC2: redshift analysis of CIZA J2242.8+5301 (Dawson+, 2015)
J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)
J/MNRAS/450/630 : MC2: SFR in CIZA J2242.8+5301 (Sobral+, 2015)
J/MNRAS/456/2829 : Radial velocities of galaxies in A523 field (Girardi+, 2016)
J/ApJ/819/114 : HFF clusters' strong lensing mass modeling (Kawamata+, 2016)
J/ApJ/817/60 : Multiply imaged supernova Refsdal (Treu+, 2016)
J/ApJ/841/7 : Spectroscopic obs & ZwCl 2341+0000 members (Benson+, 2017)
J/ApJ/838/110 : Spectroscopic survey of ZwCl 0008.8+5215 (Golovich+, 2017)
J/MNRAS/468/1917 : Concentration parameter of galaxy clusters (Rossetti+, 2017)
J/MNRAS/473/663 : MUSE and HFFs Photometry of A2744 (Mahler+, 2018)
J/ApJS/240/39 : Merging galaxy cluster deep observations (Golovich+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Cluster name
21- 29 A9 --- ID Abbreviated identifier
31- 32 I2 h RAh Hour of right ascension (J2000)
34- 35 I2 min RAm Minute of right ascension (J2000)
37- 40 F4.1 s RAs Second of right ascension (J2000)
42 A1 --- DE- Sign of declination (J2000)
43- 44 I2 deg DEd Degree of declination (J2000)
46- 47 I2 arcmin DEm Arcminute of declination (J2000)
49- 50 I2 arcsec DEs Arcsecond of declination (J2000)
52- 56 F5.3 --- z [0.07/0.55] Redshift
58- 64 A7 --- Band Discovery wavelength range
66- 69 F4.2 --- Note [5.1/5.9] Section in the paper in which
the source is detailed
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Abbreviated identifier
11- 23 A13 --- Rad Radio image
25- 42 A18 --- Ref Radio reference (author)
44- 62 A19 --- BibCode Radio reference (bibcode)
64- 73 A10 --- Tel X-ray telescope
75- 77 I3 ks Exp [12/411] Exposure time
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Cluster abbreviated identifier
12- 12 A1 --- Halo Halo component
14- 18 F5.2 Mpc lowerX [-1.4/1.2] Lower X range value (1)
20- 24 F5.2 Mpc upperX [-1.1/1.4] Upper X range value (1)
26- 30 F5.2 Mpc lowerY [-2.5/1.3] Lower Y range value (1)
32- 36 F5.2 Mpc upperY [-2.0/1.5] Upper Y range value (1)
38- 42 F5.2 1000km/s lowerZ [-2.5/2.5] Lower z range value (1)
44- 48 F5.2 1000km/s upperZ [-1.3/3.5] Upper z range value (1)
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Note (1): Relative to the global mean for each system.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Cluster abbreviated identifier
11- 12 I2 --- Mod [1/27] Model number
14- 22 A9 --- Halo Halo(s) included in the model (- = unimodal)
24- 26 I3 --- Nbkg [0/322] Number of galaxies assigned
to background model
28- 32 F5.3 --- Accept [0.04/0.3] Acceptance value
34- 39 F6.2 --- Diff [0/444]? The BIC-BICmin value (1)
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Note (1): Bayesian Information Criterion (BIC):
BIC=-2logL+k(logm-log2π) - Equation (6)
where logL is the log-likelihood function, k=8n+7 is the number of
free parameters to be estimated for n subclusters, and m is the number
of data points (galaxies in our case). See Section 4.3.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Feb-2021